Convert gg to flif Online: gg2flif

You can use Tom's Editor to easily convert images from
Koala Painter 2, packed .GG to Free Lossless Image Format .FLIF.
Tom's Editor is a free, online image manipulation and converter program.

Go to Tom's Editor

GG

Koala Painter is a Commodore 64 program do edit images. GG images are packed using RLE compression.

FLIF

Free Lossless Image Format is an image format with extension FLIF.